High-speed mechanical power press



Filed March 12, 1949 INVENTOR. WILLIAM KLOCKE ATTORNEY.

Patented July 24,1951 j 2,562,044

.1 UNITED STATES PATENT OFFICE 7 '7 "2,562,044 I I "IHGH SIi'EiJD MECHANICAL I'POWER PRESS William 'Klobke, Woodhaven; N. Y. Appliczifionmarjbfi 12, 1949, seri51 No. 81,128.. v

of the annular slot 39 in the hub 30. Attached to the dog 42 is a treadle rod 46, and reacting on the dog 42 is a spring 48 normally pressing the dog 42 toward the slot 39. When the dog 42 is removed from the notch 46 in the clutch pin 34,

the spring 36 presses the pin 34 toward the flywheel pulley and into one of the notches 26 or 21, whereupon the clutch is engaged, causing the fly-wheel pulley to rotate the crank-shaft I6. When the treadle rod 46 is released, the dog 42 enters the slot 39, and the wedge-shaped end 44 of the dog 42 enters the notch in the clutch pin 34 and moves the clutch pin out of the slot 26 or 21 in which it was lodged. Thereupon, the crank-shaft I6 is disengaged from the fiy-wheel pulley 20, and comes to a stop. The notches 26 and 21 are so located that at the time of disengagement of the clutch, the slide I4 is at the top of a stroke. As usual, the engagement and disengagement of the clutch is done at the top of the stroke. Between the crank-shaft I6 and the slide I are driving connections which effect two strokes of the slide for each rotation of the crank-shaft.

These driving connections consist of a slide toggle embodying a pair of links 50, 5| pivotally connected at 52. One end of the lower link 5| is pivotally connected to the slide I4, as indicated at 54, and an end of upper link is pivotally...

connected to the upper part of the frame ID, as indicated at 56. Between the crank-shaft I6 and the pair of links 50, 5| is a bell crank 60, which is pivotally connected to the upper part of the frame, as indicated at 62.

pivotal connection 56. One arm 64 of the bell crank is pivotally connected to a secondary driving link 66, as indicated at 68. Link 66 is also The best position Of;.; the pivotal connection 62 is somewhat above the pivotally connected to the upper link 50 of the-wslide toggle, as indicated at 69. .The other arm ID of the bell crank has a primary driving link I2 pivotally connected thereto, as indicated at I4, and the other end of link I2 is connected on the crank-shaft I6, as indicated at I6.

The length of the link I2 is such that the pivotal connection I4 of the bell crank 60 is swung through an arc of 90 bisected by a verticalline passing through the pivotal connection 62 of the bell crank 60 to the press frame ID, for each 180 of rotation of the crank-shaft I6. That is, the action of the rotating crank-shaft I6 isalways to swing the connected links 56, 5|, from a position of alinement, toward the back of the press.

The positions of the driving connections.

through one full rotation of the crank-shaft I6 connection I6 of the crank-shaft I6 is at the left;

hand extreme of its throw. Fig. 2 shows the position of the parts when the crank I6 on crankshaft I 6 has moved through an arc of 90. At this time, the press slide I4 is at the bottom of its stroke, the pivotally connected links 56, 5| of the slide toggle are in alinement, or on dead centers and the same condition is simultaneously true of the secondary link 66 and the arm 64 of the bell crank. At the same time the driving crank is midway of its backward throw and the pivotal;

connection I4 of the bell crank 60 is at the vertical line which passes through the axis of the pivotal connection 62 of the bell crank to the frame. The next of movement of the crank I6 of the crank shaft I6 is shown in Fig. 3. Here the pivotally connected slide toggle links 50, 5| are again bent inwardly toward the back of the frame, lifting the press slide I4 to the top of its stroke (the same position shown in Fig. 1), the pivotal connection I4 of the bell crank is 45 to the right of the vertical line passing through the pivotal connection 62 of the bell crank 60 to the press frame, the crank I6 of the crank-shaft I6 is at the right hand extreme of its throw, and the pivotal connection 68 of the bell crank 60 is at the vertical line which passes through'the pivotal connection of the bell crank 60 to the frame. The position of the slide driving parts at the next 90 of movement of the crank I6 of the crank-shaft I6 is shown in Fig. 4. The slide I4 is at the bottom of its stroke, with the pair of pivoted links 50, 5| in alinement, i. e., on dead centers and with the pivotal connection I4 of the bell crank 6|) at the vertical line which passes through the pivotal connection 62 of the bell crank 60 to the press frame- The link 66 and arm 64 are also in alinement, i. e., on dead centers and the driving crank is midway of its forward throw. The parts have thus returned to the relative positions of Figure 2. The next 90 of movement of the crank I6 of the crank-shaft I6 brings the slide I4 and its driving parts back to the position shown in Fig. 1, thus completing one full rotation of the crank-shaft I6 and two strokes of the press slide I4.

The rotation of the crank-shaft I6 at a speed of the strokes per minutes of the slide I4 enables the clutch 24 to operate under conditions of shock and timing at which it would not satisfactorily operate on a press having the same number of strokes per minute, as the number of revolutions per minute of the crank-shaft, when the strokes per minute exceeded about 300. In other words, the presentinvention enables a press to be operated at a number of strokes per minute well exceeding the number of rotations per .minute of a crank-shaft at which it is practical to control the operations of thepress by means of a positive-type clutch.

Moreover, the movement of the pivotally connected pair of links 50, 5| always toward the back of the press from aposition of alinement, is of major importance from the standpoint of the safety and mental comfort of the press operator. If the pivotally connected links 50, 5| darted outwardly toward the head of the press operator, in rapid succession, during the operation of a rapid press, the'operator might, in the vcourse of time, be injured, and the operator at all times would be distracted and uneasy in his mind by reason of the slide connections constantly. darting towards his head.

connections 62, 68,169 ofthebell crank 60. and

link 66 are simultaneously in alinement. These positions are the same at two positions of the crank 16, 180 apart, corresponding to two strokes of the slide for each revolution of crank-shaft Hi. There is consequently two simultaneously actin toggles (pivoted links 50, which constitute the slide toggle and pivoted link 66 and arm 64 of bell crank 60) approaching and reaching zero motion at the end-part of the slide movement on its working stroke. As a consequence, the slide l4 moves much more slowly as it approaches and moves away from the end of its working stroke, than does the slide of an ordinary press which is directly driven from a crank. With the press of the present invention, therefore, the initial contact of the forming tools on the material operated on is relatively mild, and the force of the press is transmitted to the material more in the nature of a push or squeeze than a sharp blow. By this kind of action in a high speed press, the material acted on by the forming tools has time to set to the contour of the forming tools and the tendency of the material to spring back as the forming tools separate with the lift of the slide is overcome or greatly diminished.

What is claimed is:

1. A power press having a frame, a tool-carrying slide guided for up and down movement, a slide toggle embodying upper and lower links with the upper end of the upper link pivoted to the frame and the lower end of the lower link pivoted to the slide, a driving crank on the frame, a bell crank between the driving crank and said toggle, a primary driving link connecting the driving crank to a primary arm of the bell crank, and a secondary driving link connecting a secondary arm of the bell crank to a pivot on the upperlink of the toggle, the bell crank being pivoted to the frame at that point occupied by the axis of the bell crank when the secondary link and the secondary arm of the bell crank are on dead centers with the links of the slide toggle on dead centers and the crank midway of its throw, whereby the slide makes two working strokes for each complete rotation of the driving crank.

2. A power press according to claim 1, wherein the axis of the bell crank pivot is above both the axis of rotation of the driving crank and the pivotal connection between the frame and the upper end of the upper link of the slide toggle.

3. A power press having a frame, a tool-carrying slide guided for up and down movement, a slide toggle embodying upper and lower links with the upper end of the upper link pivoted to the frame and the lower end of the lower link pivoted to the slide, a driving crank on the frame, a bell crank between the driving crank and said toggle, primary driving connections between the driving crank and one arm of the bell crank, and a secondary driving link connecting the other arm of the bell crank to a pivot on the upper link of the toggle, the bell crank being pivoted to the frame at that point where the secondary link and the corresponding end of the bell crank are on dead centers when the links of the. toggle are on dead centers and the crank is midway of its throw, whereby the slide makes two workin strokes for each complete rotation of the driving crank.

WILLIAM KLOCKE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 336,978 Adams Mar. 12, 1886 1,110,977 Wel'ch Sept. 15, 1914 1,574,465 Beyer Feb. 23, 1926 2,056,402 Klocke -L Oct. 6, 1936 2,161,869 Klocke June 13, 1939 2,271,771 Klocke Feb. .3, 1942 

